Shared folder SMB/CIFS on NAS is not visible

I installed OMV 4.0.15 on my NAS built with a hd SSD and 3 HD in RAID5.
All right
I have created and mounted RAID5 and give it the name "Archivio"
All right
So I created an user "alex" with default parameters: group "users" and shell "/bin/bash"
Finally I created a shared folder "Documenti"
Now
I checked on NAS and the empty folder was created in "//sharedfolders/Documenti" as in "//srv/dev-disk-by-label-archive/Documenti"
In ""//srv/" exist a folder "ftp" too.
Finally
I activated FTP, SMB/CIFS and SSH

Now connecting to the NAS server from my "Ubuntu 16.04 LTS" PC using the file manager and clicking on "network", it shows:

If I click on "openmediavault - SSH" everything OK, I log in to the NAS and navigate
If I click on "openmediavault - FTP" I can not access in any way!
If I click on "openmediavault - SMB/CIFS" or "OPENMEDIAVAULT" a blank and empty screen will open and I cannot do nothing!
if I click on "Rete Windows" it' show a folder "WORKGROUP" and if I clisk on open a screen with 2 folders "OPENMEDIAVAULT" and "UBUNTU" and If I click on "OPENMEDIAVAULT" a blank and empty screen will open and I cannot do nothing!

Yes, I created a shared folder. But the problem as described is intermittent. On one occasion I also happily created 3 files and edited them. But with a new startup everything disappears.
There is some mechanism that activates the otherwise non-active SMB functionality.
What to check to see if the SMB is active when starting the NAS?

Shared folder SMB/CIFS on NAS is not visible

Yes, I created a shared folder. But the problem as described is intermittent. On one occasion I also happily created 3 files and edited them. But with a new startup everything disappears.
There is some mechanism that activates the otherwise non-active SMB functionality.
What to check to see if the SMB is active when starting the NAS?

Just to be clear. Have you been able to get to your "Documenti" folder via SMB on your Ubuntu?

Yes, I created a shared folder. But the problem as described is intermittent. On one occasion I also happily created 3 files and edited them. But with a new startup everything disappears.
There is some mechanism that activates the otherwise non-active SMB functionality.
What to check to see if the SMB is active when starting the NAS?

Just to be clear. Have you been able to get to your "Documenti" folder via SMB on your Ubuntu?

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YES

Now the situation has worsened further, no more access to the Windows network and this is the error that appears!!!